On selected platforms, x4 DDR devices can be supported. Using x4 devices may
lower the performance, but generally they are available for higher density.
Tested on MT36JSF2G72PZ-1G9E1 RDIMM.
Signed-off-by: York Sun <york...@freescale.com>
---
arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c | 4 ++++
arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c | 1 +
arch/powerpc/cpu/mpc8xxx/ddr/interactive.c | 4 ++++
arch/powerpc/cpu/mpc8xxx/ddr/options.c | 2 ++
arch/powerpc/include/asm/fsl_ddr_dimm_params.h | 1 +
arch/powerpc/include/asm/fsl_ddr_sdram.h | 1 +
6 files changed, 13 insertions(+)
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
index a6f8d95..3a63a04 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ctrl_regs.c
@@ -684,6 +684,7 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr,
unsigned int odt_cfg = 0; /* ODT configuration */
unsigned int num_pr; /* Number of posted refreshes */
unsigned int slow = 0; /* DDR will be run less than 1250 */
+ unsigned int x4_en = 0; /* x4 DRAM enable */
unsigned int obc_cfg; /* On-The-Fly Burst Chop Cfg */
unsigned int ap_en; /* Address Parity Enable */
unsigned int d_init; /* DRAM data initialization */
@@ -728,6 +729,8 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr,
ap_en = 0;
}
+ x4_en = popts->x4_en ? 1 : 0;
+
#if defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
/* Use the DDR controller to auto initialize memory. */
d_init = popts->ECC_init_using_memctl;
@@ -750,6 +753,7 @@ static void set_ddr_sdram_cfg_2(fsl_ddr_cfg_regs_t *ddr,
| ((odt_cfg & 0x3) << 21)
| ((num_pr & 0xf) << 12)
| ((slow & 1) << 11)
+ | (x4_en << 10)
| (qd_en << 9)
| (unq_mrs_en << 8)
| ((obc_cfg & 0x1) << 6)
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
b/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
index 3e7c269..b67158c 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c
@@ -129,6 +129,7 @@ ddr_compute_dimm_parameters(const ddr3_spd_eeprom_t *spd,
pdimm->ec_sdram_width = 0;
pdimm->data_width = pdimm->primary_sdram_width
+ pdimm->ec_sdram_width;
+ pdimm->device_width = 1 << ((spd->organization & 0x7) + 2);
/* These are the types defined by the JEDEC DDR3 SPD spec */
pdimm->mirrored_dimm = 0;
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/interactive.c
b/arch/powerpc/cpu/mpc8xxx/ddr/interactive.c
index 46257c9..2bc3516 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/interactive.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/interactive.c
@@ -207,6 +207,7 @@ static void fsl_ddr_dimm_parameters_edit(fsl_ddr_info_t
*pinfo,
DIMM_PARM(primary_sdram_width),
DIMM_PARM(ec_sdram_width),
DIMM_PARM(registered_dimm),
+ DIMM_PARM(device_width),
DIMM_PARM(n_row_addr),
DIMM_PARM(n_col_addr),
@@ -265,6 +266,7 @@ static void print_dimm_parameters(const dimm_params_t
*pdimm)
DIMM_PARM(primary_sdram_width),
DIMM_PARM(ec_sdram_width),
DIMM_PARM(registered_dimm),
+ DIMM_PARM(device_width),
DIMM_PARM(n_row_addr),
DIMM_PARM(n_col_addr),
@@ -445,6 +447,7 @@ static void fsl_ddr_options_edit(fsl_ddr_info_t *pinfo,
CTRL_OPTIONS(twoT_en),
CTRL_OPTIONS(threeT_en),
CTRL_OPTIONS(ap_en),
+ CTRL_OPTIONS(x4_en),
CTRL_OPTIONS(bstopre),
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
@@ -689,6 +692,7 @@ static void print_memctl_options(const memctl_options_t
*popts)
CTRL_OPTIONS(threeT_en),
CTRL_OPTIONS(registered_dimm_en),
CTRL_OPTIONS(ap_en),
+ CTRL_OPTIONS(x4_en),
CTRL_OPTIONS(bstopre),
CTRL_OPTIONS(wrlvl_override),
CTRL_OPTIONS(wrlvl_sample),
diff --git a/arch/powerpc/cpu/mpc8xxx/ddr/options.c
b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
index 2f13b8f..e02d76d 100644
--- a/arch/powerpc/cpu/mpc8xxx/ddr/options.c
+++ b/arch/powerpc/cpu/mpc8xxx/ddr/options.c
@@ -703,6 +703,8 @@ unsigned int populate_memctl_options(int
all_DIMMs_registered,
}
#endif
+ popts->x4_en = (pdimm[0].device_width == 4) ? 1 : 0;
+
/* Choose burst length. */
#if defined(CONFIG_FSL_DDR3)
#if defined(CONFIG_E500MC)
diff --git a/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
b/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
index ffe4db8..bd312ad 100644
--- a/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
+++ b/arch/powerpc/include/asm/fsl_ddr_dimm_params.h
@@ -26,6 +26,7 @@ typedef struct dimm_params_s {
unsigned int primary_sdram_width;
unsigned int ec_sdram_width;
unsigned int registered_dimm;
+ unsigned int device_width; /* x4, x8, x16 components */
/* SDRAM device parameters */
unsigned int n_row_addr;
diff --git a/arch/powerpc/include/asm/fsl_ddr_sdram.h
b/arch/powerpc/include/asm/fsl_ddr_sdram.h
index 640d329..bac22fc 100644
--- a/arch/powerpc/include/asm/fsl_ddr_sdram.h
+++ b/arch/powerpc/include/asm/fsl_ddr_sdram.h
@@ -277,6 +277,7 @@ typedef struct memctl_options_s {
unsigned int mirrored_dimm;
unsigned int quad_rank_present;
unsigned int ap_en; /* address parity enable for RDIMM */
+ unsigned int x4_en; /* enable x4 devices */
/* Global Timing Parameters */
unsigned int cas_latency_override;
--
1.7.9.5
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